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hba
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This is not a proof ?

hba
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sin3A= something which we have to prove ?

hba
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@mustry Please reply ?

ajprincess
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Prove sin3A=?
sin3A=sin(A+2A)
use
sin(A+B)=sinAcosB+cosAsinB
sin2A=2sinAcosA

mustry
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good

mustry
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actually u know

mustry
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no ur suppose to expand it

mustry
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sin(2A+A)=sin2AcosA+cos2AsinA

mustry
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BUT cos2A=cos^A+sin^A

ajprincess
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cos2A=cos^2Asin^2A
=12sin^2A
=2cos^2A1

mustry
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OKAY put it in the equestn

mustry
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ur r8